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Vortex inhibition was investigated in drag reducing fluids. The effect of the vortex inhibition was measured in a swirling converging channel using small impellers, the rotation of which was driven by the vortex flow in the channel. Thus, the vortex inhibition was detected from the reduction of the impeller rotational speed. The drag reduction had a good correlation with the vortex inhibition, but not with the viscoelastic characteristics. Twisting-shear viscosity obtained was much higher than the shear viscosity. Twisting-shear viscosity could be used to predict the drag reduction.

Vortex inhibition effect in drag reducing fluids